<UFT Related Support Tip> Innability to launch IE in 32 bit mode (10 / 11 / later versions)
In some occassions you might work with an application under test that should be only opened in a 32 bit browser due to a application's design requirement.
And after the initial attempts you may discover that in certain environments IE will not let you to start in 32 bit mode, only 64.
After some research in Internet, I found that it's related to a Windows registry entry called "TabProcGrowth", that when is set to 0, will cause this issue. If any other greater value is specified, it'll allow you to work as expected.
There are some other suggestions related to "Protected Mode" settings, for additional information you might research in MS solutions database.
If you find that this or any post resolves your issue, please be sure to mark it as an accepted solution."